kara joined, paula left, ellen arrived, now simon, ellen, and kara are gone. the last man standing? randy jackson. >> i'm going to honestly, honestly miss you. it's been a blast. thank you. >> reporter: the big question, can "idol" ever again find the right mix? especially after losing their sharp-tongued standout. simon cowell is launching his own show on fox. >> without simon it's like "the ellen show" without ellen. it's weird. it will limp along. hopefully, it will find new chemistry that will make it relevant for the next generation. >> reporter: whatever they decide, they better do it soon. callbacks start in a couple of weeks. for "good morning america," jeremy hubbard, abc news, new york. >> and if they want steven tyler, they have to lay out the bread. >> and j. lo. elton john. steven perry. a lot of star power there. >> like weekend "gma." >>> another horrific acid attack leaves a woman severely burned. was it a copycat crime? we'll talk to an expert. here, take the card. you go to the shops... i'll meet you at the gate. thanks. please remove all metal objects out of your